Patent GB-190324400-A (GB)
Title: Improvements in or connected with Automatic Looms.
Filed: 1903-11-10
Granted: 1904-10-27
Abstract: 24,400. Baker, W. H., and Mather & Platt. Nov. 10. Loom shuttle-changing mechanism; weft, cutting; shuttles.-In automatic shuttle-changing looms, particularly of the type described in Specification No. 18,234, A.D. 1899, means are provided for operating the placer rod, and for actuating the weft-cutting knife, for preventing the rebound of the placer on its return, for operating the shifting cam through which the shuttle-changing mechanism is operated, for preventing an expelled shuttle from falling into the working parts of the loom, for retaining the shuttles in the magazine until ejected by the placer, and for inserting and retaining the weft in the shuttle. The placer rod E, Fig. 6, is fulcrumed on the same axle as a bar which carries a pivoted bell-crank lever A hiving a slot C adapted to engage a pin D on the placer rod, and having its short arm connected by a spring F to the bar. When a fresh shuttle is to be inserted, the bar is moved towards the lay by suitable cam and rod connections, and carries the placer rod E with it. Should the placer meet an obstruction, the bell crank A turns about its pivot, the slot C slides over the pin D, and the spring F is extended, as shown. When the impediment is overcome, the spring F causes the mechanism to assume its normal position. The upper end of the bar is formed to strike against the weft-cutter operating lever on its forward stroke, so as to actuate the knife to its full extent, in the manner described in Specification No. 24,614, A.D. 1901. When the placer returns, a stud J, Fig. 8, on the rod E strikes a weighted bell crank G, H pivoted on the loom frame A'. The weight G is forced outwards, so that a recess I on the cam H temporarily engages the stud J, and the momentum of the placer is overcome, and it is prevented from rebounding. A fixed stop K limits the motion of the weight G. When the shuttle-changing mechanism is to be operated, a short lever P, Fig. 3, pivoted on the upper end of an upright N carried by a shaft M, is, through the action of the usual magnets or operating-mechanism, caused to be engaged bv the weft hammer O which is actuated by a cam O<1> on the cam shaft A'. The motion of the weft hammer is imparted to the upright N, and causes a partial rotation of the shaft M. An arm fixed to the other end of the shaft M carries a flanged roller, which is thus raised into the path of the shifting cam, causing it on its rotation to be moved along its shaft A<2> into a position to actuate the shuttle-changing mechanism in the manner described in Specification No. 11,053, A.D. 1903. To guide the expelled shuttles into the usual receptacle, one or more bars or rods are attached to the back of the lay, and extend into or through the receptacle, being retained in position by means of friction rollers or guides. The expelled shuttles are thereby prevented from falling into the working parts of the loom. One or more blade springs are attached to the side of the magazine facing the lay, and extend for a short distance over the exit aperture of the magazine, so that the lowest shuttle is held in until the placer is operated, and only one shuttle is ejected at a time. The shuttle spindles are detachable, so that the cops can be skewered away from the loom, and the cops and spindles transferred together to the shuttles. A groove a, Fig. 12, is formed on the spindle b, and, when the spindle is in position in the shuttle c, the groove is engaged by a pin d fixed in the shuttle. The spindle is preferably inserted in a pivoted socket e held in position by spring pressure in the shuttle, and cut away on the underside to allow the groove a to be engaged by the pin d.